Patent US3431046A successfully refreshed from Google Patents.
US3431046A
Expired / Lapsed
US
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Flexible polyethylene corneal contact lens
Assignee: Studies Inc
•
Filing: 1964-02-14
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Granted: 1969-03-04
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Expires: 1984-02-14
Abstract
No abstract record available.
Inventors
- 👤 Tom J Conrad
- 👤 Glenn O Dayton Jr
- 👤 Max Arlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:34
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2241415A
Cited
GB802486A
Cited
US3221083A
Cited
US3203306A
Cited
US3228741A
Cited
US3317330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-03 | 1972-09-02 | 1973-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-03 | 1976-09-02 | 1977-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-03 | 1980-09-02 | 1981-03-04 | $7700.00 | Window Closed / Lapsed |